from machine import Pin
from utime import sleep

pin_bouton = Pin(2, Pin.IN, Pin.PULL_DOWN)
pin_led = Pin(15, Pin.OUT)

while True:
    if pin_bouton.value() == 1:
        pin_led.on()
        sleep(0.5)
        pin_led.off()
        sleep(0.5)
    else:
        pin_led.off()